The manufacturer of Tuffstuff concrete pavers claims its products have a breaking strength of 5 kN..
The manufacturer of Tuffstuff concrete pavers claims its products have a breaking strength of 5 kN. A representative of a building advisory organisation is interested in assessing this claim and sends a number of pavers to be tested in a laboratory. The representative wants to know with 95% confidence, within ±0.05, what proportion of pavers perform the job as claimed by the manufacturer. a. How many pavers does the laboratory need to test? What assumption should be made about the population proportion? The laboratory tests 50 pavers, and 42 have the breaking strength claimed. b. Construct a 95% confidence interval estimate for the population proportion that have the breaking strength claimed c. How can the representative use the results of (b) to advise the public about the product? May 22 2022 08:56 AM
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